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    Gamov, Alexander.
    Fermion parity of phases supporting multiple Majorana modes in a superconducting nanowire / A. Gamov, A. O. Zlotnikov // J. Sib. Fed. Univ. Math. Phys. - 2023. - Vol. 16, Is. 6. - P. 820-829 ; Журн. СФУ. Матем. и физ. - Cited References: 22. - Gamov A. acknowledges the support of the Theoretical Physics and Mathematics Advancement Foundation "BASIS" . - ISSN 1997-1397. - ISSN 2313-6022
   Перевод заглавия: Фермионная четность в фазах с множеством майорановских мод в сверхпроводящей нанопроволоке
Кл.слова (ненормированные):
Fermion parity -- superconducting nanowire -- Majorana modes -- topological invarian -- topological phase diagram -- фермионная четность -- сверхпроводящая нанопроволока -- майорановские моды -- топологический инвариан -- топологическая фазовая диаграмма
Аннотация: The fermion parity of the ground state is determined in various topological phases of the semiconducting nanowire under external magnetic field with proximity-induced superconductivity and strong spin-orbit interaction. Electron hopping as well as spin-flip hopping due to spin-orbit coupling and superconducting pairings in the second coordination sphere are taken into account. The connection between the fermion parity and the parity of the BDI topological invariant is shown. The formation of topological phases with three and four pairs of Majorana modes has been demonstrated.
Для полупроводниковой нанопроволоки, помещенной во внешнее магнитное поле, с наведенной сверхпроводимостью и сильным спин-орбитальным взаимодействием определена фермионная четность основного состояния в различных топологических фазах при учете перескоков электронов, включая перескоки с переворотом спина за счет спин-орбитальной связи, и сверхпроводящих спариваний во второй координационной сфере. Показана связь фермионной четности и четности BDI топологического инварианта. Продемонстрировано формирование топологических фаз с тремя и четырьмя парами майорановских мод.

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Держатели документа:
Siberian Federal University, Krasnoyarsk, Russian Federation
Kirensky Institute of Physics Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Zlotnikov, A. O.; Злотников, Антон Олегович

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Publisher Correction: Multiple fermion scattering in the weakly coupled spin-chain compound YbAlO3 (Nature Communications, (2021), 12, 1, (3599), 10.1038/s41467-021-23585-z) / S. E. Nikitin, S. Nishimoto, Y. Fan [et al.] // Nat. Commun. - 2021. - Vol. 12, Is. 1. - Ст. 4428, DOI 10.1038/s41467-021-24744-y . - ISSN 2041-1723
Аннотация: The original version of this Article contained an error in ref. 20, which was incorrectly given with the wrong title as: “Agrapidis, C. E., van den Brink, J. & Nishimoto, S. Ground state and low-energy excitations of the Kitaev-Heisenberg two-leg ladder. Phys. Rev. B 99, 224423 (2019)”. The correct form of ref. 20 is: “Agrapidis, C. E., van den Brink, J. & Nishimoto, S. Field-induced incommensurate ordering in Heisenberg chains coupled by Ising interaction: model for ytterbium aluminum perovskite YbAlO3. Phys. Rev. B 99, 224423 (2019)”. This has been corrected in the PDF and HTML versions of the Article.

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Держатели документа:
Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
Institut fur Festkorper- und Materialphysik, Technische Universitat Dresden, Dresden, Germany
Department of Physics, Technical University Dresden, Dresden, Germany
Institute for Theoretical Solid State Physics, IFW Dresden, Dresden, Germany
Department of Physics and Beijing Key Laboratory of Opto-Electronic Functional Materials and Micro-Nano Devices, Renmin University of China, Beijing, China
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China
Tsung-Dao Lee Institute and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China
Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, United States
Department of Physics, Southern University of Science and Technology, Shenzhen, China
Kirensky Institute of Physics, Federal Research Center, Krasnoyarsk, Russian Federation
Helmholtz-Zentrum Berlin fur Materialien und Energie, Berlin, Germany
Heinz Maier-Leibnitz Zentrum, Technische Universitat Munchen, Garching, Germany
Lviv Polytechnic National University, Lviv, Ukraine
Paul Scherrer Institute, Villigen PSI, Villigen, Switzerland

Доп.точки доступа:
Nikitin, S. E.; Nishimoto, S.; Fan, Y.; Wu, J.; Wu, L. S.; Sukhanov, A. S.; Brando, M.; Pavlovskii, N. S.; Павловский, Николай Сергеевич; Xu, J.; Vasylechko, L.; Yu, R.; Podlesnyak, A.
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Multiple fermion scattering in the weakly coupled spin-chain compound YbAlO3 / S. E. Nikitin, S. Nishimoto, Y. Fan [et al.] // Nat. Commun. - 2021. - Vol. 12, Is. 1. - Ст. 3599, DOI 10.1038/s41467-021-23585-z. - Cited References: 34. - We acknowledge C.D. Batista for fruitful discussions, U. Nitzsche for technical assistance, P.Y. Portnichenko for help with the neutron-scattering experiment, and B. Normand for insightful suggestions and careful proofreading of the manuscript. This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by Oak Ridge National Laboratory. S.N. acknowledges support by the Deutsche Forschungsgemeinschaft through SFB 1143 project no. A05. S.E.N. and A.S.S. acknowledge support from the International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM). The work at Renmin University was supported by the Ministry of Science and Technology of China, National Program on Key Research Project (grant number 2016YFA0300504), the National Science Foundation of China (grant number 11674392), and the Fundamental Research Funds for the Central Universities and the Research Funds of Renmin University of China (grant number 18XNLG24). J.W. acknowledges additional support from a Shanghai talent program. The work at Shanghai Jiao Tong University is sponsored by the Natural Science Foundation of Shanghai with grant no. 20ZR1428400 and Shanghai Pujiang Program with grant no. 20PJ1408100 (J.W) . - ISSN 2041-1723
Кл.слова (ненормированные):
detection method -- electron -- inorganic compound -- neutron diffraction -- quantum mechanics -- scattering -- fermion
Аннотация: The Heisenberg antiferromagnetic spin-1/2 chain, originally introduced almost a century ago, is one of the best studied models in quantum mechanics due to its exact solution, but nevertheless it continues to present new discoveries. Its low-energy physics is described by the Tomonaga-Luttinger liquid of spinless fermions, similar to the conduction electrons in one-dimensional metals. In this work we investigate the Heisenberg spin-chain compound YbAlO3 and show that the weak interchain coupling causes Umklapp scattering between the left- and right-moving fermions and stabilizes an incommensurate spin-density wave order at q = 2kF under finite magnetic fields. These Umklapp processes open a route to multiple coherent scattering of fermions, which results in the formation of satellites at integer multiples of the incommensurate fundamental wavevector Q = nq. Our work provides surprising and profound insight into bandstructure control for emergent fermions in quantum materials, and shows how neutron diffraction can be applied to investigate the phenomenon of coherent multiple scattering in metals through the proxy of quantum magnetic systems.

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Держатели документа:
Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
Institut fur Festkorper- und Materialphysik, Technische Universitat Dresden, Dresden, Germany
Department of Physics, Technical University Dresden, Dresden, Germany
Institute for Theoretical Solid State Physics, IFW Dresden, Dresden, Germany
Department of Physics and Beijing Key Laboratory of Opto-Electronic Functional Materials and Micro-Nano Devices, Renmin University of China, Beijing, China
Tsung-Dao Lee Institute and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China
Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, United States
Department of Physics, Southern University of Science and Technology, Shenzhen, China
Kirensky Institute of Physics, Federal Research Center, Krasnoyarsk, Russian Federation
Helmholtz-Zentrum Berlin fur Materialien und Energie, Berlin, Germany
Lviv Polytechnic National University, Lviv, Ukraine
Paul Scherrer Institute, Villigen PSI, Villigen, Switzerland
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China
Heinz Maier-Leibnitz Zentrum, Technische Universitat Munchen, Garching, Germany

Доп.точки доступа:
Nikitin, S. E.; Nishimoto, S.; Fan, Y.; Wu, J.; Wu, L. S.; Sukhanov, A. S.; Brando, M.; Pavlovskii, N. S.; Павловский, Николай Сергеевич; Xu, J.; Vasylechko, L.; Yu, R.; Podlesnyak, A.
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Fedoseev, A. D.
The edge states properties of the topological insulator with fermion path nonanalyticity points located at the edge / A. D. Fedoseev // J. Phys.: Condens. Matter. - 2020. - Vol. 32, Is. 21. - Ст. 215301, DOI 10.1088/1361-648X/ab73a9. - Cited References: 46. - The author thanks V V Val'kov and M M Korovushkin for the fruitful discussions and valuable remarks. The reported study was funded by the RAS Presidium program for fundamental research No. 32 'Nanostructures: physics, chemistry, biology and technology fundamentals', the Russian Foundation for Basic Research (project nos. 19-02-00348, 18-32-00443), Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research projects: 'Manifestation of Coulomb interactions and effects of restricted geometry in properties of topological edge states of nanostructures with spin–orbit coupling' (No. 18-42-243017), Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. MK-3722.2018.2) . - ISSN 0953-8984
Кл.слова (ненормированные):
Topological insulator -- Edge states -- Electron transport
Аннотация: The edge states properties of a finite-size 2D topological insulator (TI) with the open boundary conditions in both directions are studied. It is shown that fermion path nonanalyticity points appearing on the edge of finite-size TI cause a nonuniform edge state distribution along the TI edge. The character of this distribution depends substantially on the edge state's energy position in the bulk band gap. The edge state with the energy in the middle of the gap tends to be located in the corners between two nonparallel edges of the system, while the edge states with the energy close to the bulk band edge avoid the corners. The monotonic transition from one space distribution of the edge state wave function to another along the edge state's band is observed. The mentioned edge state's structure leads to the nonlinear current-voltage characteristic of the square-shaped TI with contacts connected with the corners of the device. It opens the possibility to control the current with the gate voltage and is useful for construction the nano-size devices. For the edge states with energy in the middle of a bulk gap, the vortex structure of the probability flux located near corners is found.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center Ksc Sb Ras, Akademgorodok 50/38, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Федосеев, Александр Дмитриевич
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Val'kov, V. V.
Ground-State Fermion Parity and Caloric Properties of a Superconducting Nanowire / V. V. Val'kov, V. A. Mitskan, M. S. Shustin // J. Exp. Theor. Phys. - 2019. - Vol. 129, Is. 3. - P. 426-437, DOI 10.1134/S1063776119080144. - Cited References: 74. - This work was supported by the Russian Foundation for Basic Research (project nos. 16-02-00073, 18-32-00443, 18-42-243017, 18-42-243018), the Government of the Krasnoyarsk Kray, the Krasnoyarsk Kray Science Foundation within the scientific projects “Contact Phenomena and Magnetic Disorder in the Formation and Detection of Topologically Protected Edge States in Semiconductor Nanostructures” (project no. 18-42-243018), “Manifestation of Coulomb Interactions and Bounded-Geometry Effects in the Properties of Topological Edge States of Nanostructures with Spin–Orbit Interactions” (project no. 18-42-243017). One of us (Sh. M. S.) thanks the Council for Grants of the Russian President (project nos. MK-3594.2018.2 and MK-3722.2018.2). . - ISSN 1063-7761
Кл.слова (ненормированные):
Nanowires -- Quantum interference devices -- Semiconductor insulator boundaries -- Topology
Аннотация: Abstract: The ground-state structure and fermion parity have been determined for a semiconductor nano-wire with a strong Rashba spin–orbit interaction and proximity-induced superconductivity placed in an external magnetic field under periodic boundary conditions. Allowance for the open boundaries is shown to cause the topologically nontrivial parameter region to be partitioned into a set of subregions with a different ground-state fermionic parity. This peculiarity is related to the emergence of edge modes with nonmonotonically changing excitation energies in the system as its parameters change. At the quantum transition point, at which the ground-state fermionic parity changes, the edge-mode energy is zero. The magneto- and electrocaloric effects are shown to be effective characteristics that allow the series of quantum transitions in an open nanowire to be identified experimentally. These effects at low temperatures exhibit an anomalous behavior in the parameter region for which topologically stable Majorana modes are realized in long nanowires. © 2019, Pleiades Publishing, Inc.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC, Siberian Branch, Russian Academy of Sciences, AkademgorodokKrasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Mitskan, V. A.; Мицкан, Виталий Александрович; Shustin, M. S.; Шустин, Максим Сергеевич; Вальков, Валерий Владимирович
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Val'kov, V. V.
Effect of total reflection from a symmetric two-channel device with fermion path nonanalyticity points induced by Rashba spin-orbit coupling / V. V. Val’kov, A. D. Fedoseev // Bull. Russ. Acad. Sci. Phys. - 2018. - Vol. 82, Is. 5. - P. 550-553, DOI 10.3103/S1062873818050313. - Cited References: 8. - The reported study was funded by Russian Foundation for Basic Research (project nos. 16-42-242036, 16-42-243056, and 17-42-240441), Government of Krasnoyarsk Territory, and Krasnoyarsk Region Science and Technology Support Fund to the research (project nos. 22/17, 24/17, and 02/17). . - ISSN 1062-8738
Кл.слова (ненормированные):
Electron transport -- Nonanalyticity -- Rashba spin-orbit coupling -- Regular polygon -- Spin-orbit couplings -- Symmetric systems -- Total reflection -- Transmission coefficients
Аннотация: The effect Rashba spin-orbit coupling has on transmission coefficient through a symmetric system with fermion path nonanalyticity points is illustrated using the example of a regular polygon-shaped chain. It is shown that the current passage through a device is blocked at the critical spin-orbit coupling values determined by the system’s geometry. At the near-critical spin-orbit coupling values, electron transport is possible only in a narrow range of energies.

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Публикация на русском языке Вальков, Валерий Владимирович. Эффект полного отражения электронов от симметричного двухканального устройства с точками неаналитичности фермионных траекторий, вызванный спин-орбитальным взаимодействием Рашбы [Текст] / В. В. Вальков, А. Д. Федосеев // Изв. РАН. Сер. физич. - 2018. - Т. 82 № 5. - С. 622-625

Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Fedoseev, A. D.; Федосеев, Александр Дмитриевич; Вальков, Валерий Владимирович
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Val'kov, V. V.
Fano antiresonance induced by the rashba spin-orbit coupling in systems with conduction channels exhibiting the points of nonanalyticity in fermion paths / V. V. Val'kov, A. D. Fedoseev // JETP Letters. - 2017. - Vol. 106, Is. 5. - P. 302-307, DOI 10.1134/S0021364017170131. - Cited References:17. - This work was funded by the Russian Foundation for Basic Research (project nos. 16-42-242036, 16-42-243056, and 17-42-240441), Government of the Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the Research (project nos. 21/16, 29/16, and 02/17). . - ISSN 0021-3640. - ISSN 1090-6487

РУБ Physics, Multidisciplinary

Аннотация: It is shown that the combined effect of the nonanalyticity of the channel for the motion of charge carriers and the Rashba spin-orbit coupling induces resonant anomalies in the transport characteristics of nanosystems related to the size quantization. When the characteristic length determined by the ratio of the hopping integral and the spin-orbit coupling constant coincides with the distance between the points of nonanalyticity, the size effect arises in the channel. It manifests itself in the complete reflection from the device, which can be treated as the Fano antiresonance. The current-voltage characteristics of the nanosystem with the nonanalytical channel undergo significant changes at slight variations of the spin-orbit coupling constant near its critical value.

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Публикация на русском языке Вальков, Валерий Владимирович. Индуцирование спин-орбитальным взаимодействием Рашбы размерного антирезонанса Фано в каналированных системах с точками неаналитичности фермионных траекторий [Текст] / В. В. Вальков, А. Д. Федосеев // Письма в Журн. эксперим. и теор. физ. - 2017. - Т. 106 Вып. 5. - С. 282-287

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Fed Res Ctr KSC, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Fedoseev, A. D.; Федосеев, Александр Дмитриевич; Вальков, Валерий Владимирович; Russian Foundation for Basic Research [16-42-242036, 16-42-243056, 17-42-240441]; Government of the Krasnoyarsk Territory; Krasnoyarsk Region Science and Technology Support Fund [21/16, 29/16, 02/17]
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Stability of the d-wave pairing with respect to the intersite Coulomb repulsion in cuprate superconductors / V. V. Val'kov [et al.] // J. Magn. Magn. Mater. - 2017. - Vol. 440. - P. 123-126, DOI 10.1016/j.jmmm.2016.12.090. - Cited References: 23. - The work was supported by the Siberian Branch of Russian Academy of Sciences (project no. 0358-2015-0002, Complex Program II.2P), the Russian Foundation for Basic Research (RFBR) and partly by the Government of Krasnoyarsk Region and the Krasnoyarsk Region Science and Technology Support Fund (projects nos. 16-42-240435 and 16-42-243057). The work of A.F.B. was funded by RFBR (project no. 16-02-00304). The work of M.M.K. was supported by grant of the President of the Russian Federation (project MK-1398.2017.2). . - ISSN 0304-8853

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
HUBBARD-MODEL
EXCITATIONS
Кл.слова (ненормированные):
Cuprate superconductors -- Spin-fermion model -- Intersite Coulomb repulsion
Аннотация: Within the spin-fermion model for cuprate superconductors, the influence of the intersite Coulomb interactions V2 and V′2V′2 between holes located at the next-nearest-neighbor oxygen ions of CuO2 plane on the implementation of the dx2−y2dx2−y2-wave pairing is studied. It is shown that d-wave pairing can be suppressed only for unphysically large values of V2 and V′2V′2.
В рамках спин-фермионной модели для купратных сверхпроводников изучено влияние межузельных кулоновских отталкиваний V2 и V2' между дырками, находящимися на следующих за ближайшими ионах кислорода CuO2-плоскости, на реализацию сверхпроводящего dx2y2-спаривания. Показано, что d-спаривание подавляется только при нефизически больших значениях параметров V2 и V2'.

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Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Barabanov, A. F.; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН
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Valkov, V. V.
Generalized Kondo lattice model and its spin-polaron realization by the projection method for cuprates / V. V. Valkov, D. M. Dzebisashvili, A. F. Barabanov // Theor. Math. Phys. - 2017. - Vol. 191, Is. 2. - P. 752-763, DOI 10.1134/S0040577917050142. - Cited References:35. - This research was supported by the Russian Foundation for Basic Research (Grant No. 16-02-00073, 16-02-00304, and 16-42-240435) and the Siberian Branch of the Russian Academy of Sciences (Complex Program No. II.2P, Grant No. 0358-2015-0005). . - ISSN 0040-5779. - ISSN 1573-9333

РУБ Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTIVITY
HIGH-TC SUPERCONDUCTORS
COPPER OXIDES
Кл.слова (ненормированные):
strong electron correlation -- spin-fermion model -- Kondo lattice model -- spin polaron
Аннотация: The spin-fermion model, which is an effective low-energy realization of the three-band Emery model after passing to the Wannier representation for the px and py orbitals of the subsystem of oxygen ions, reduces to the generalized Kondo lattice model. A specific feature of this model is the existence of spin-correlated hoppings of the current carriers between distant cells. Numerical calculations of the spectrum of spin-electron excitations highlight the important role of the long-range spin-correlated hoppings.

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Держатели документа:
RAS, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk, Russia.
Reshetnyov Siberian State Aerosp Univ, Krasnoyarsk, Russia.
RAS, Inst High Pressure Phys, Troitsk, Moscow Oblast, Russia.

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Barabanov, A. F.; Вальков, Валерий Владимирович; Russian Foundation for Basic Research [16-02-00073, 16-02-00304, 16-42-240435]; Siberian Branch of the Russian Academy of Sciences (Complex Program) [II.2P, 0358-2015-0005]
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10.

Val'kov, V. V.
Dynamicalmagnetic susceptibility in the spin-fermion model for cuprate superconductors / V. V. Val'kov, D. M. Dzebisashvili // Theor. Math. Phys. - 2017. - Vol. 193, Is. 3. - P. 1853-1864, DOI 10.1134/S004057791712011X. - Cited References:35. - This research was supported by the Russian Foundation for Basic Research (Grant No. 16-02-00073), the Administration of Krasnoyarsk Kray and the Krasnoyarsk Kray Foundation for Scientific and Technical Progress (Grant No. 16-42-240435), and the complex program No. II.2P of the Siberian Branch of the Russian Academy of Sciences (Grant No. 0356-2015-0405). . - ISSN 0040-5779. - ISSN 1573-9333

РУБ Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
T-J MODEL
   LONG-RANGE-ORDER
   POLARON
   CUO2
   EXCITATIONS
   LATTICE
   WAVE
Кл.слова (ненормированные):
high-temperature conductor -- spin-fermion model -- magnetic susceptibility -- spin polaron
Аннотация: Using the method of diagram techniques for the spin and Fermi operators in the framework of the SU(2)-invariant spin-fermion model of the electron structure of the CuO2plane of copper oxides, we obtain an exact representation of the Matsubara Green’s function D⊥(k, iω m ) of the subsystem of localized spins. This representation includes the Larkin mass operator ΣL(k, iω m ) and the strength and polarization operators P(k, iω m ) and Π(k, iω m ). The calculation in the one-loop approximation of the mass and strength operators for the Heisenberg spin system in the quantum spin-liquid state allows writing the Green’s function D⊥(k, iω m ) explicitly and establishing a relation to the result of Shimahara and Takada. An essential point in the developed approach is taking the spin-polaron nature of the Fermi quasiparticles in the spin-fermion model into account in finding the contribution of oxygen holes to the spin response in terms of the polarization operator Π(k, iω m ).

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Публикация на русском языке Вальков, Валерий Владимирович. Динамическая магнитная восприимчивость в спин-фермионной модели купратных сверхпроводников [Текст] / В. В. Вальков, Д. М. Дзебисашвили // Теор. и мат. физика. - 2017. - Т. 193 Вып. 3. - С. 515-529

Держатели документа:
RAS, Siberian Branch, Fed Res Ctr, Kirensky Inst Phys,KSC, Krasnoyarsk, Russia.
Siberian State Aerosp Univ, Krasnoyarsk, Russia.

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Вальков, Валерий Владимирович; Russian Foundation for Basic Research [16-02-00073]; Krasnoyarsk Kray Foundation for Scientific and Technical Progress [16-42-240435]; Siberian Branch of the Russian Academy of Sciences [II.2P, 0356-2015-0405]; Administration of Krasnoyarsk Kray
}
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11.

Val'kov, V. V.
Spin-polaron nature of fermion quasiparticles and their d-wave pairing in cuprate superconductors / V. V. Val’kov, D. M. Dzebisashvili, A. F. Barabanov // JETP Letters. - 2016. - Vol. 104, Is. 10. - P. 730-741, DOI 10.1134/S002136401622015X. - Cited References: 52 . - ISSN 0021-3640
Аннотация: In the framework of the spin-fermion model, to which the Emery model is reduced in the limit of strong electron correlations, it is shown that the fermion quasiparticles in cuprate high-Tcsuperconductors (HTSCs) arise under a strong effect of exchange coupling between oxygen holes and spins of copper ions. This underlies the spin-polaron nature of fermion quasiparticles in cuprate HTSCs. The Cooper instability with respect to the d-wave symmetry of the order parameter is revealed for an ensemble of such quasiparticles. For the normal phase, the spin-polaron concept allows us to reproduce the fine details in the evolution of the Fermi surface with the changes in the doping level x observed in experiment for La2-xSrxCuO4. The calculated T–x phase diagram correlates well with the available experimental data for cuprate HTSCs. © 2016, Pleiades Publishing, Inc. All Right Reserved.

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Публикация на русском языке Вальков, Валерий Владимирович. Спин-поляронная природа фермиевских квазичастиц и их d-волновое спаривание в купратных сверхпроводниках [Текст] / В. В. Вальков, Д. М. Дзебисашвили, А. Ф. Барабанов // Письма в Журн. эксперим. и теор. физ. : Наука, 2016. - Т. 104 Вып. 9-10. - С. 745-757

Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, Russian Federation
Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow, Russian Federation

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Barabanov, A. F.; Вальков, Валерий Владимирович
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12.

The reason for implementation of the d–wave rather than s–wave pairing in cuprate superconductors / V. V. Val'kov [et al.] // VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016) : abstracts / ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk : KIP RAS SB, 2016. - Ст. I2.2. - P. 122. - References: 6. - The work was supported by the RFBR, grant № 16-02-00073, 16-02-00304 . - ISBN 978-5-904603-06-9
Кл.слова (ненормированные):
cuprate superconductors -- spin-fermion model -- Coulomb repulsion

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Barabanov, A. F.; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН

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13.

Val'kov, V. V.
The influence of spin and charge fluctuations on the coexistence phase of superconductivity and antiferromagnetism in heavy-fermion Ce-based compounds / V. V. Val'kov, A. O. Zlotnikov // VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016) : abstracts / ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk : KIP RAS SB, 2016. - Ст. O2.3. - P. 136. - References: 2. - This study was funded by the Program of SB RAS 0358-2015-0002 and RFBR project No. 16-02-00073-a. A.O.Z. is grateful for support of the Grant of the President of the Russian Federation SP-1370.2015.5. . - ISBN 978-5-904603-06-9
Кл.слова (ненормированные):
heavy fermions -- antiferromagnetism -- superconductivity -- Ginzburg-Landau theory

Доп.точки доступа:
Zlotnikov, A. O.; Злотников, Антон Олегович; Вальков, Валерий Владимирович; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН

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14.

    Val'kov, V. V.
    Origin of the spin polaron quasiparticles and their cooper instability in High-Tc superconductors / V. V. Val'kov, D. M. Dzebisashvili, A. F. Barabanov // J. Supercond. Nov. Magn. - 2016. - Vol. 29, Is. 4. - P. 1049-1055, DOI 10.1007/s10948-016-3383-8. - Cited References:15. - This study was supported by the Russian Foundation for Basic Research, projects nos. 13-02-00523, 13-02-00909 and the Dynasty Foundation. . - ISSN 1557-1939. - ISSN 1557-1947
   Перевод заглавия: Природа спин-поляронных квазичастиц и их куперовской неустойчивости в высокотемпературных сверхпроводниках

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
Model
State
Кл.слова (ненормированные):
Cuprate High-T-c superconductors -- Spin polarons -- Spin-fermion model
Аннотация: IIn the framework of the spin-fermion model, it is shown that accounting for the strong spin-charge fluctuations between holes of copper and oxygen ions in cuprate High-T c superconductors leads to the formation of the Fermi spin-polaron quasiparticles. It is demonstrated that the large value of the binding energy of such quasiparticle is determined by the processes in which hopping intensity of the oxygen holes depends significantly on the spin configuration of holes on the copper and oxygen ions. It was found that the ensemble of such quasiparticles manifests Cooper instability and the concentration dependence of the critical temperature is in good agreement with the experimental data.

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Держатели документа:
SB RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia.
RAS, Inst High Pressure Phys, Troitsk 142098, Moscow Region, Russia.

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Barabanov, A. F.; Вальков, Валерий Владимирович; Russian Foundation for Basic Research [13-02-00523, 13-02-00909]; Dynasty Foundation
}
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15.

Kagan, M. Y.
High-Tc and Low-Tc superconductivity in electron systems with repulsion / M. Y. Kagan, V. A. Mitskan, M. M. Korovushkin // J. Supercond. Nov. Magn. - 2016. - Vol. 29, Is. 4. - P. 1043-1048, DOI 10.1007/s10948-016-3384-7. - Cited References:31. - The authors are grateful to V. V. Val'kov, I. S. Burmistrov, M. V. Feigel'man, and A. Ya. Tzalenchuk for valuable remarks. This work is supported by the Russian Foundation for Basic Research (nos. 14-02-00058 and 14-02-31237). One of the authors (M. Yu. K.) gratefully acknowledges support from the Basic Research Program of the National Research University Higher School of Economics. Another one (M. M. K.) thanks the scholarship SP-1361.2015.1 of the President of Russia and the Dynasty foundation. . - ISSN 1557-1939. - ISSN 1557-1947

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
Fermion systems
   Doped graphene
   Hubbard-model
   Phase-diagram
   Superfluidity
   Density
Кл.слова (ненормированные):
Unconventional superconductivity -- Kohn-Luttinger mechanism -- Graphene
Аннотация: We demonstrate the instability of the normal state of purely repulsive fermionic systems towards the transition to the Kohn-Luttinger superconducting state. We construct the superconducting phase diagrams of these systems in the framework of the Hubbard and Shubin-Vonsovsky models on the square and hexagonal lattices. We show that an account for the long-range Coulomb interactions, as well as the Kohn- Luttinger renormalizations, lead to an increase in the critical superconducting temperatures in various materials, such as high-temperature superconductors, idealized monolayer, and bilayer of doped graphene. Additionally, we discuss the role of the structural disorder and the nonmagnetic impurities in superconducting properties of real graphene systems.

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Держатели документа:
PL Kapitsa Phys Problems Inst, Moscow 119334, Russia.
Natl Res Univ, Higher Sch Econ, Moscow 109028, Russia.
SB RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia.
Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia.
KTH Royal Inst Technol, NORDITA, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden.
Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden.

Доп.точки доступа:
Mitskan, V. A.; Мицкан, Виталий Александрович; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Russian Foundation for Basic Research [14-02-00058, 14-02-31237]; Basic Research Program of the National Research University Higher School of Economics; Dynasty foundation; [SP-1361.2015.1]
}
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16.

    Val'kov, V. V.
    Spin wave theory of heavy-fermion antiferromagnets in the framework of the periodic anderson model / V. V. Val'kov, A. O. Zlotnikov // Spin Waves 2015, Int. Symp. : abstracts. - СПб., 2015
   Перевод заглавия: Спин-волновая теория тяжелофермионных антиферромагнетиков в рамках периодической модели Андерсона

Материалы конференции

Доп.точки доступа:
Zlotnikov, A. O.; Злотников, Антон Олегович; Вальков, Валерий Владимирович; "Spin Waves", International Simposium(2015 ; Jun. ; 7-13 ; Saint Petersburg); Физико-технический институт им. А.Ф. Иоффе РАН
}
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17.

Val'kov, V. V.
d-Wave pairing in an ensemble of spin polaron quasiparticles in the spin-fermion model of the electronic structure of the CuO2 plane / V. V. Val'kov, D. M. Dzebisashvili, A. F. Barabanov // Phys. Lett. A. - 2015. - Vol. 379, Is. 5. - P. 421-426, DOI 10.1016/j.physleta.2014.11.036. - Cited References:26. - This study was supported by the Russian Foundation for Basic Research,projects Nos. 13-02-00523, 13-02-00909 and 13-02-98013 (Siberia) and theDynasty Foundation. . - ISSN 0375. - ISSN 1873-2429. -

РУБ Physics, Multidisciplinary
Рубрики:
SUPERCONDUCTIVITY
ANTIFERROMAGNETISM
Кл.слова (ненормированные):
Hight-temperature cuprate superconductors -- Tree-band p-d model -- Spin -- polaron -- Strong electron correlations
Аннотация: It is demonstrated for the first time that the strong coupling between spin moments of copper ions and oxygen holes, which arises upon hybridization mixing of two hole subsystems in the Emery model, not only affects the formation of spin polaron quasiparticles but also ensures effective attraction between them via the exchange interaction. This results in the Cooper instability with d-wave pairing in a 2D ensemble of spin polaron quasiparticles. The T-x phase diagram obtained using this approach agrees well with the available experimental data. (C) 2014 Elsevier B.V. All rights reserved.

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Держатели документа:
RAS, LV Kirensky Inst Phys, SB, Krasnoyarsk 660036, Russia.
Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia.
Inst High Pressure Phys, Troitsk 142098, Moscow Region, Russia.

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Barabanov, A. F.; Вальков, Валерий Владимирович; Dynasty Foundation; Russian Foundation for Basic Research (Siberia) [13-02-00523,13-02-00909, 13-02-98013]
}
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18.

    Val'kov, V. V.
    Nature of Cooper instability of spin polarons in cuprate high-Tc superconductors / V. V. Val'kov, D. M. Dzebisashvili, A. F. Barabanov // J. Low Temp. Phys. - 2015. - Vol. 181, Is. 3-4. - P. 134-138, DOI 10.1007/s10909-015-1331-9. - Cited References:10. - This study was supported by the Russian Foundation for Basic Research, Projects Nos. 13-02-00523, 13-02-00909 and the Dynasty Foundation. . - ISSN 0022. - ISSN 1573-7357
   Перевод заглавия: Природа куперовской неустойчивости спиновых поляронов в купратных высокотемпературных сверхпроводниках

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
OXIDES
MODEL
Кл.слова (ненормированные):
High-T-c superconductors -- Spin polarons -- Spin-fermion model
Аннотация: It is shown that the exchange interaction in the subsystem of localized moments of copper ions can trigger a Cooper instability in the ensemble of spin-polaron quasiparticles in cuprate high-temperature superconductors. It is important that, inherent to cuprates, strong coupling between Fermi and spin degrees of freedom leads on the one hand to formation of spin-polaron quasiparticles and, on the other hand, allows to transfer the interaction between Bose degrees of freedom onto the interaction between Fermi quasiparticles. The solution of the integral equation for the d-wave superconducting order parameter is well consistent with the available experimental data.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia.
MF Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia.
Russian Acad Sci, Inst High Pressure Phys, Troitsk 142092, Moscow Region, Russia.

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Barabanov, A. F.; Вальков, Валерий Владимирович; Russian Foundation for Basic Research [13-02-00523, 13-02-00909]; Dynasty Foundation
}
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19.

Kagan, M. Y.
Anomalous superconductivity and superfluidity in repulsive fermion systems / M. Y. Kagan, V. A. Mitskan, M. M. Korovushkin // Phys. Usp. - 2015. - Vol. 58, Is. 8. - P. 733-761, DOI 10.3367/UFNe.0185.201508a.0785. - Cited References: 369. - We are grateful to M A Baranov, A V Chubukov, D V Efremov, M V Feigel'man, V V Kabanov, K I Kugel', M S Marienko, N M Plakida, N V Prokorev, A Ya Tzalenchuk, and V V Val'kov for the fruitful discussions and constant attention to our work. The work was supported by the Russian Foundation for Basic Research (project nos. 14-02-00058 and 14-02-31237). M Yu K thanks the Program of Basic Research of the National Research University Higher School of Economics for support. The work of MM K was supported by grant of the President of the Russian Federation (SP-1361.2015.1) and the Dinasty Foundation . - ISSN 1063-7869

РУБ Physics, Multidisciplinary
Рубрики:
HEXAGONAL BORON-NITRIDE
   SCANNING-TUNNELING-MICROSCOPY
   2-DIMENSIONAL HUBBARD-MODEL
   HIGH-TC SUPERCONDUCTIVITY
   ELECTRON-ENERGY SPECTRUM
   P-WAVE SUPERCONDUCTIVITY
   DOUBLE-LAYER GRAPHENE
   2D KONDO-LATTICE
   GROUND-STATE
   TRANSITION-TEMPERATURE
Кл.слова (ненормированные):
anomalous superconductivity -- Kohn-Luttinger mechanism -- superfluidity -- repulsive Fermi gas -- Hubbard and t-Jmodel -- Shubin Vonsovsky model -- graphene monolayer -- graphene bilayer
Аннотация: We discuss the mechanisms of unconventional superconductivity and superfluidity in 3D and 2D fermionic systems with purely repulsive interaction at low densities. We construct phase diagrams of these systems and find the areas of the superconducting state in free space, as well as on the lattice in the framework of the Fermi-gas model with hard-core repulsion, the Hubbard model, the Shubin-Vonsovsky model, and the t-J model. We demonstrate that the critical superconducting temperature can be greatly increased in the spin-polarized case or in a two-band situation already at low densities. The proposed theory is based on the Kohn-Luttinger mechanism or its generalizations and explains or predicts anomalous p-, d-, and f-wave pairing in various materials, such as high-temperature superconductors, the idealized monolayer and bilayer of doped graphene, heavy-fermion systems, layered organic superconductors, superfluid 3He, spin-polarized 3He mixtures in 4He, ultracold quantum gases in magnetic traps, and optical lattices.

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Публикация на русском языке Каган, Максим Юрьевич. Аномальная сверхпроводимость и сверхтекучесть в фермионных системах с отталкиванием [Текст] / М. Ю. Каган, В. А. Мицкан, М. М. Коровушкин // Успехи физ. наук : ред. журн. "Успехи физ. наук", 2015. - Т. 185 № 8. - С. 785-815

Держатели документа:
Kapitza Institute for Physical Problems, Russian Academy of Sciences, ul. Kosygina 2, Moscow, Russian Federation
National Research University, Higher School of Economics, ul. Myasnitskaya 20, Moscow, Russian Federation
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50, str. 38, Krasnoyarsk, Russian Federation
Reshetnev Siberian State Aerospace University, prosp. Gazety Krasnoyarskii rabochii 31, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Mitskan, V. A.; Мицкан, Виталий Александрович; Korovushkin, M. M.; Коровушкин, Максим Михайлович
}
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20.

Kuz'min, V. I.
Comparison of the electronic structure of the Hubbard and t - J models within the cluster perturbation theory / V. I. Kuz'min, S. V. Nikolaev, S. G. Ovchinnikov // Phys. Rev. B. - 2014. - Vol. 90, Is. 24. - Ст. 245104, DOI 10.1103/PhysRevB.90.245104. - Cited References: 37. - This work is supported by RFBR (Grants No. 13-02-01395-a, No. 14-02-31677-mol-a, and No. 14-02-00186-a), the Ministry of Education and Science of Russia (Government Contract No. 3085, SibFU 2014 GF-2), and a grant of the Russian President (Grant No. NSh-2886.2014.2). . - ISSN 1098-0121. - ISSN 1550-235X

РУБ Physics, Condensed Matter
Рубрики:
FERMION SYSTEMS
SUPERCONDUCTIVITY
METAL
Аннотация: Electronic dispersion and density of states (DOS) have been calculated for the Hubbard model and the t−J and t−J∗ models with three-site correlated hopping by the cluster perturbation theory. We have found a rather strong quantitative difference both in dispersion and DOS at all doping for the Hubbard and t−J models at the energy scale ω≳t. The three-site correlated hopping addition results in an almost negligible difference for the Hubbard and t−J∗ models. Close to the Fermi energy, at the scale ω≲J, the electronic structure of all three models is similar. We have found the line of zeros of the Green function for the t−J model that has been previously obtained for the Hubbard model by cellular dynamical mean-field theory calculations.

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Держатели документа:
SB RAS, LV Kirensky Inst Phys, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Nikolaev, S. V.; Николаев, Сергей Викторович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Кузьмин, Валерий Ипполитович; RFBR [13-02-01395-a, 14-02-31677-mol-a, 14-02-00186-a]; Ministry of Education and Science of Russia [3085, SibFU 2014 GF-2]; [NSh-2886.2014.2]
}
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